MAX494CSD-T Equivalent & Substitute Parts Reference

Part Overview

The MAX494CSD-T is a General Purpose Amplifier integrated circuit manufactured by Analog Devices Inc./Maxim Integrated, configured as a 4-circuit rail-to-rail operational amplifier in 14-SOIC surface mount packaging. This part is classified as Obsolete, which necessitates identification of functionally equivalent active alternatives for new designs and production continuity. The MAX494CSD-T operates across a 2.7V to 6V supply range with moderate slew rate and bandwidth characteristics suitable for general-purpose signal conditioning applications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Output Type	Rail-to-Rail	—
Slew Rate	0.2	V/µs
Gain Bandwidth Product	500	kHz
Current - Input Bias	25	nA
Voltage - Input Offset	200	µV
Current - Supply (x4 Channels)	150	µA
Current - Output / Channel	30	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	6	V
Operating Temperature	0 to 70	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MAX494CSD-T is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Package type: 14-SOIC surface mount form factor
Circuit count: 4 independent amplifier circuits
Output configuration: Rail-to-rail output capability
Supply voltage range: Minimum 2.7V, maximum 6V overlap required
Amplifier classification: General Purpose operational amplifier

Secondary Compatibility Parameters:

Slew rate: 0.2V/µs or greater
Gain bandwidth product: 500 kHz or greater
Input bias current: 25 nA or lower
Input offset voltage: 200 µV or lower
Output current per channel: 30 mA or greater
Operating temperature: Must support 0°C to 70°C minimum

Substitute parts are grouped into two categories: Direct Package Variants (same base product with different packaging/tape configurations) and Functional Equivalents (different manufacturers meeting all electrical and mechanical criteria).

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (kHz)	Input Bias (nA)	Input Offset (µV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package
MAX494CSD-T	Analog Devices/Maxim	Obsolete	0.2	500	25	200	150	30	2.7	6	0 to 70	14-SOIC
MAX494CSD+T	Analog Devices/Maxim	Active	0.2	500	25	200	150	30	2.7	6	0 to 70	14-SOIC
AD8609ARZ-REEL	Analog Devices	Active	0.1	400	0.0002	12	40	70	1.8	5	-40 to 125	14-SOIC
AD8609ARZ-REEL7	Analog Devices	Active	0.1	400	0.0002	12	40	70	1.8	5	-40 to 125	14-SOIC
LMV324MX/NOPB	Texas Instruments	Active	1	1000	15	1700	410	160	2.7	5.5	-40 to 125	14-SOIC
MCP624-E/SL	Microchip Technology	Active	10	20000	0.005	200	2500	70	2.5	5.5	-40 to 125	14-SOIC
MCP624T-E/SL	Microchip Technology	Active	10	20000	0.005	200	2500	70	2.5	5.5	-40 to 125	14-SOIC
TLV2454AID	Texas Instruments	Active	0.11	220	500	300	23	10	2.7	6	-40 to 125	14-SOIC
TLV2454AIDR	Texas Instruments	Active	0.11	220	500	300	23	10	2.7	6	-40 to 125	14-SOIC
TLV2454CD	Texas Instruments	Obsolete	0.11	220	500	300	23	10	2.7	6	0 to 70	14-SOIC
TLV2454ID	Texas Instruments	Active	0.11	220	500	300	23	10	2.7	6	-40 to 125	14-SOIC

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Identical Electrical Performance):

MAX494CSD+T is the active production equivalent of MAX494CSD-T, maintaining identical electrical specifications and operating temperature range. This part is the primary recommendation for direct substitution in existing designs. Both parts are ROHS3 compliant with MSL 1 rating and identical supply voltage requirements (2.7V to 6V).

Tier 2 - Functional Equivalents (Supply Voltage Compatible, Enhanced Performance):

TLV2454AID, TLV2454AIDR, and TLV2454ID are active Texas Instruments parts meeting the 2.7V to 6V supply range requirement. These parts maintain identical input offset voltage (200 µV) and supply voltage span as the original MAX494CSD-T. However, they exhibit lower slew rate (0.11V/µs vs. 0.2V/µs) and reduced gain bandwidth product (220 kHz vs. 500 kHz), with significantly lower output current per channel (10 mA vs. 30 mA). These parts are suitable only for applications where reduced performance parameters are acceptable. All three are ROHS3 compliant with MSL 1 rating and support extended temperature operation (-40°C to 125°C).

Tier 3 - Enhanced Performance Alternatives (Expanded Supply Range, Higher Performance):

LMV324MX/NOPB (Texas Instruments) and MCP624-E/SL / MCP624T-E/SL (Microchip Technology) offer superior performance metrics including higher slew rates, greater gain bandwidth products, and higher output current capabilities. LMV324MX/NOPB operates across 2.7V to 5.5V with 1V/µs slew rate and 1 MHz bandwidth. MCP624 variants operate across 2.5V to 5.5V with 10V/µs slew rate and 20 MHz bandwidth. These parts are suitable for applications requiring enhanced dynamic performance. All are ROHS3 compliant with MSL 1 rating and support extended temperature operation (-40°C to 125°C).

Tier 4 - CMOS Technology Alternative:

AD8609ARZ-REEL and AD8609ARZ-REEL7 (Analog Devices) employ CMOS technology with extremely low input bias current (0.2 pA) and superior input offset voltage (12 µV). However, these parts operate across a narrower supply range (1.8V to 5V) and exhibit lower slew rate (0.1V/µs) and reduced gain bandwidth product (400 kHz). These parts are suitable only for applications where ultra-low input bias current is critical and supply voltage remains within 1.8V to 5V bounds.

Compliance and Certification:

All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols. All parts are classified under ECCN EAR99 and HTSUS 8542.33.0001.

Frequently Asked Questions (FAQ)

Q: Can MAX494CSD+T be used as a direct replacement for MAX494CSD-T?

A: Yes. MAX494CSD+T is the active production variant of the same base product (MAX494) with identical electrical specifications, supply voltage range (2.7V to 6V), and operating temperature range (0°C to 70°C). Both are packaged in 14-SOIC surface mount form factor. The primary difference is product status: MAX494CSD-T is obsolete while MAX494CSD+T is active.

Q: What is the key difference between the TLV2454 series and the original MAX494CSD-T?

A: The TLV2454 series (TLV2454AID, TLV2454AIDR, TLV2454ID) maintains the same supply voltage range (2.7V to 6V) and input offset voltage (200 µV) as the MAX494CSD-T. However, it exhibits reduced slew rate (0.11V/µs vs. 0.2V/µs), lower gain bandwidth product (220 kHz vs. 500 kHz), and significantly lower output current per channel (10 mA vs. 30 mA). Selection of TLV2454 variants requires confirmation that the application can tolerate these reduced performance parameters.

Q: Why do the AD8609 parts have a narrower supply voltage range than the MAX494CSD-T?

A: The AD8609 series uses CMOS technology optimized for lower supply voltages (1.8V to 5V) compared to the MAX494CSD-T (2.7V to 6V). While CMOS technology provides superior input bias current characteristics (0.2 pA vs. 25 nA), it operates at lower maximum supply voltage. Applications requiring 5.5V or 6V operation cannot use AD8609 variants.

Q: Are all substitute parts available in 14-SOIC packaging?

A: Yes. All substitute parts listed in this reference are available in 14-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring mechanical and electrical compatibility with existing PCB layouts designed for MAX494CSD-T.

Q: What is the difference between MCP624-E/SL and MCP624T-E/SL?

A: MCP624-E/SL is supplied in Tube packaging, while MCP624T-E/SL is supplied in Tape & Reel (TR) packaging. Both parts are identical in electrical specifications and performance characteristics. Selection between these variants depends on assembly process requirements and quantity handling preferences.

Q: Can LMV324MX/NOPB be used in applications designed for MAX494CSD-T?

A: LMV324MX/NOPB is functionally compatible with MAX494CSD-T in terms of package, circuit count, and rail-to-rail output configuration. However, it exhibits higher supply current (410 µA vs. 150 µA), higher input offset voltage (1.7 mV vs. 200 µV), and operates across a slightly narrower maximum supply voltage (5.5V vs. 6V). Applications must verify that these performance differences are acceptable for their specific requirements.

Q: What is the operating temperature range difference between MAX494CSD-T and its active substitutes?

A: MAX494CSD-T operates across 0°C to 70°C. Most active substitutes (TLV2454 series, LMV324MX/NOPB, MCP624 series, AD8609 series) support extended temperature operation from -40°C to 125°C. Applications requiring operation only within 0°C to 70°C can use any substitute; applications requiring extended low-temperature operation (-40°C) must select from the active substitutes listed.

Q: Are all parts ROHS3 compliant?

A: Yes. All parts listed in this reference, including MAX494CSD-T and all substitute parts, are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, ensuring compatibility with standard manufacturing processes and environmental regulations.

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